On Tue, 17 Jan 2012 17:18:17 +0100, Daniel Vetter <daniel at ffwll.ch> wrote: > I've just noticed that we seem to miss this plug to fix fbc issues. Care > to resend a proper patch in case we still need this? > > Also, I we could try to also disable fbc when we detect frontbuffer > rendering (and generally abolish setting up the fence to detect such > writes), maybe that helps with our fbc troubles (if it's actually worth > it). Eugeni? I'm testing whether disabling fbc when fb is busy helps on my troublesome SNB. But X can and will still access the scanout through a fence, so we can't simply abolish setting up fences here. The other recourse is to always used a shadow buffer so that we never access the scanout directly, and perhaps restrict that to only use render as well. -Chris -- Chris Wilson, Intel Open Source Technology Centre
